Improvement in picker-arms for looms



GEO. NV. PATERSON, OF NEVVBURYPORT, MASSACHUSETTS, ASSIGNOR TO HIMSELF AND H. M. PAYNE, OF SAME PLACE.

IMPROVEMENT IN PICKER-ARMS FOR LOOIVIS.

Specification forming part of Letters `Patent No. 55,959, dated June 26, 1866.

To all uhom it may concern:

Be it known that I, GEORGE W. PATERSON,

of Newburyport, in the county of Essex and State of Massachusetts, have invented certain new and useful Improvements in Cotton- Looms; and I hereby declare the following to be a full, clear, a-nd exact description of the same, reference being had to the accompanying drawings, in which- Figure l is a longitudinal vertical section of that part of the loom to which my improvement is applied. Fig. 2 is a transverse vertical section of the same on the line a' a', Fig. 1. Fig. 3 is an elevation, showing the rocker, cam-wheel, and picker.A Fig. 4 is aplanview, looking up from beneath, ofthe rocker and arm or paw for giving motion to the same.

Ally invention relates to that part of the mechanism of a cotton-loom which actuates the shuttle; and its object is to lessen the friction on the shuttle-cam or the cani-wheel by which the rocking motion is given to the shaft on which the picker is mounted, and also to prevent the oil used for lubricating the roller on the arm of the rocker from being thrown and spattered upon the ways or lathe, or any other part of the loom adjoining the picker-arm.

The ordinary arrangement of the mechanism referred to is substantially as follows:

The arm or paw,7 as it is technically termed, y

which extends out from the rocker for the purpose of conveying the motion of the shuttle cam to the picker-stick, is a straight bar of metal of suitable length, in the outer end of which a friction-roller has its bearings. This `roller is usually set in a recess cut'throngh the aim for its reception, and it is so placed as to be in contact with the camwheel which gives the jerking throwing motion to the picker. By means of a spring or other suitable mechanical devices the frictionroller is held against the surface of the cam at any desired degree of pressure. During the operation of weaving the cam revolves with great rapidity to give the requisite jerking motion to each picker-stick, whereby the shuttle is thrown continually back and forth in the shuttle race or shed. When thus revolving the cam-w heel communicates its motion to the friction-roller with whichit is in contact. The roller in its revolution is struck rapidly and forcibly7 by the revolving cam, which projects from the wheel, which causes the oil used for lubricating the bearings of the roller to ily from itand to spatter over the parts of the loom above and by the side of the picker-arm, and even over the material which is being worked up in the loom. This is a very objectionable feature in the use of the roller, and the object of my invention partly is to remedy this defect, the other object I have in view being, as has been above mentioned, to lessen the friction of the roller on the shuttle-cam.

In orderV to accomplish my purpose I make the friction-roller of an ovoidal shape and of chilled iron, tapering equally toward the ends which form the bearings, by which it 1s held to the picker-arm.

Instead of using the ordinary form of picker'- arm, l make the arm or paw hollow, to correspond with the egg-shaped roller, so that the outer part of saidparm forms an ovoidal shell open at the bottom, or at that point where the roller should come in contact with the cam. In the shell or cavity thus formed the roller has its bearings, and it has been found that this arrangement lessens greatly the friction on the cam, while at the same tiine,the roller being nearly entirely surrounded by the shell formed by the picker-arm, the oil is caught in the shell and prevented from liying over the loom.

The nature of my invention will be fully understood by reference to the accompanying drawings. The picker-arm or paw a there represented has a cavity or hollow formed in its outer end corresponding in shape to the roller b. This roller, made of chilled iron,

)referabl i is of an ovoidal sha ie and ta ers from the middle equally toward both ends, which form the bearings of the roller.

As seen in the drawings, the outer end of the roller is held in a recess formed for it in the outer end of the picker-arm, while the inner end ofthe roller is held in place by a pin, m, which is passed through from one side to the other of the picker-arm, just underneath that end. after it has been placed in proper position within the shell. By this arrangement the roller can revolve with the greatest ease and the friction on the cam-wheel is greatly diminished.

When the cam-Wheel c, Fig. 3, moves it carries with it the roller b, and When the machinery is in motion they both revolve with eX- treme rapidity, the cani on the Wheel striking,` the roller incessantly and forcibly, and giving the jerking; motion hereinbefore mentioned to the picker-slick d, Fig. 3.

During the rapid revolution of the roller, and especially when it is struck by the cam, the oil used in lubricating' the mechanism sis thrown off from the roller; but instead oflespattering the loom, l as formerly, it is caught in the shell, and runs back on the roller, or if it should happen to escape from the shell it falls to the ground without doing anydamage.

In Figs. 2 and 4 the form of the shell Which surrounds the roller is fully shown, and it will he seen that the arrangement there represented completely protects the parts of the loom from the oil.

In Fig. 3 Which represents, in elevation all the parts of the device, a is the picker-arm or paw.; b, the ovoidal roller; c, the shuttle-cam; d, the picker-stick for throwing the shuttle, and

e the rock-shaft. The rod j', which extends downward from the rocker c, to which it is secured, connects with a spring` or other suitable device Which regulates the pressure of the frictionroller upon the cam.

What I claim as my invention, and desire to secure by Letters Patent, is-

l. The picker-arm constructed and arranged for operation substantially as herein shown and described.

i3. In a picker-arm, the combination of a friction-roller with a shell inclosing the same on top and sides, as herein described.

3. Inapicker'arm, and in combination with an inclosing-shell, as herein described, the friction-roller when ofan ovoidal or equivalent shape and having its bearings in the shell, as herein shown and set forth.

In testimony whereof l have signed my name to this specification before two subscribing` Witnesses.

G. W. PATERSON.

Witnesses:

JOHN N. PIKE, THOMAS E. lEARsoN. 

